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1999-63=1936是44的平方 1999+26=2025是45的平方 (1 2 3 4 5 6 7 8.的平方是1 4 9 16 25 36 49 64.自然數的平方的差是個等差數列3 5 7 9 11 13 15.按照這個規律找下去就可以了,要求的這個數减去63和加上26都是個平方數,那麼這兩個平方數的差就是89)
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